VoIP SIP and SKINNY quality analyzer and packet / audio recording tool
Cellular manager for mobile phones/modems
The most affordable CRM system according to Capterra
High performance, production quality STUN server and client library
Enterprise telephony recording and retrieval system
Multi user address book application accessable through the web.
SIP softphone
H.323 Gatekeeper for VoIP and videconferencing
Cress is a comprehensive toolset for graphical service/workflow design
A command line utility for remote controlling Polycom VVX IP phones
Simple and efficient tool for SIP trace filtering